Thanks @DezCookies, that is what I was getting at as well. I was doing some looking, and was looking at what the “world hit ray query” node could do, but it doesn’t seem to like anything that isn’t straight up/down either. There is also a volumetric based hit ray query node, but that one doesn’t conform to the landscape (though can be used to “minecraft-ify” a landscape I suppose). Maybe there will be something better in a later update, as PCG is still very experimental right now.